diff options
| -rw-r--r-- | include/net/mac80211.h | 12 | ||||
| -rw-r--r-- | net/mac80211/scan.c | 64 |
2 files changed, 69 insertions, 7 deletions
diff --git a/include/net/mac80211.h b/include/net/mac80211.h index daa539a4287..174dc1d7526 100644 --- a/include/net/mac80211.h +++ b/include/net/mac80211.h @@ -1307,11 +1307,13 @@ enum ieee80211_ampdu_mlme_action { * * @hw_scan: Ask the hardware to service the scan request, no need to start * the scan state machine in stack. The scan must honour the channel - * configuration done by the regulatory agent in the wiphy's registered - * bands. When the scan finishes, ieee80211_scan_completed() must be - * called; note that it also must be called when the scan cannot finish - * because the hardware is turned off! Anything else is a bug! - * Returns a negative error code which will be seen in userspace. + * configuration done by the regulatory agent in the wiphy's + * registered bands. The hardware (or the driver) needs to make sure + * that power save is disabled. When the scan finishes, + * ieee80211_scan_completed() must be called; note that it also must + * be called when the scan cannot finish because the hardware is + * turned off! Anything else is a bug! Returns a negative error code + * which will be seen in userspace. * * @sw_scan_start: Notifier function that is called just before a software scan * is started. Can be NULL, if the driver doesn't need this notification. diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c index 46f35dc6acc..3bf9839f591 100644 --- a/net/mac80211/scan.c +++ b/net/mac80211/scan.c @@ -214,6 +214,66 @@ void ieee80211_scan_failed(struct ieee80211_local *local) local->scan_req = NULL; } +/* + * inform AP that we will go to sleep so that it will buffer the frames + * while we scan + */ +static void ieee80211_scan_ps_enable(struct ieee80211_sub_if_data *sdata) +{ + struct ieee80211_local *local = sdata->local; + bool ps = false; + + /* FIXME: what to do when local->pspolling is true? */ + + del_timer_sync(&local->dynamic_ps_timer); + cancel_work_sync(&local->dynamic_ps_enable_work); + + if (local->hw.conf.flags & IEEE80211_CONF_PS) { + ps = true; + local->hw.conf.flags &= ~IEEE80211_CONF_PS; + ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); + } + + if (!ps || !(local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) + /* + * If power save was enabled, no need to send a nullfunc + * frame because AP knows that we are sleeping. But if the + * hardware is creating the nullfunc frame for power save + * status (ie. IEEE80211_HW_PS_NULLFUNC_STACK is not + * enabled) and power save was enabled, the firmware just + * sent a null frame with power save disabled. So we need + * to send a new nullfunc frame to inform the AP that we + * are again sleeping. + */ + ieee80211_send_nullfunc(local, sdata, 1); +} + +/* inform AP that we are awake again, unless power save is enabled */ +static void ieee80211_scan_ps_disable(struct ieee80211_sub_if_data *sdata) +{ + struct ieee80211_local *local = sdata->local; + + if (!local->powersave) + ieee80211_send_nullfunc(local, sdata, 0); + else { + /* + * In !IEEE80211_HW_PS_NULLFUNC_STACK case the hardware + * will send a nullfunc frame with the powersave bit set + * even though the AP already knows that we are sleeping. + * This could be avoided by sending a null frame with power + * save bit disabled before enabling the power save, but + * this doesn't gain anything. + * + * When IEEE80211_HW_PS_NULLFUNC_STACK is enabled, no need + * to send a nullfunc frame because AP already knows that + * we are sleeping, let's just enable power save mode in + * hardware. + */ + local->hw.conf.flags |= IEEE80211_CONF_PS; + ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); + } +} + void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) { struct ieee80211_local *local = hw_to_local(hw); @@ -268,7 +328,7 @@ void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) /* Tell AP we're back */ if (sdata->vif.type == NL80211_IFTYPE_STATION) { if (sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED) { - ieee80211_send_nullfunc(local, sdata, 0); + ieee80211_scan_ps_disable(sdata); netif_tx_wake_all_queues(sdata->dev); } } else @@ -441,7 +501,7 @@ int ieee80211_start_scan(struct ieee80211_sub_if_data *scan_sdata, if (sdata->vif.type == NL80211_IFTYPE_STATION) { if (sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED) { netif_tx_stop_all_queues(sdata->dev); - ieee80211_send_nullfunc(local, sdata, 1); + ieee80211_scan_ps_enable(sdata); } } else netif_tx_stop_all_queues(sdata->dev); |